diff --git a/lib/gitlab/middleware/read_only.rb b/lib/gitlab/middleware/read_only.rb
index d9d5f90596f63de4f131ec02d0ece1d699ee1df1..7f63e39b3aacdcb5862e37b21ecf4a38a9f0e87b 100644
--- a/lib/gitlab/middleware/read_only.rb
+++ b/lib/gitlab/middleware/read_only.rb
@@ -13,7 +13,7 @@ module Gitlab
       end
 
       def call(env)
-        ReadOnly::Controller.new(@app, env).call
+        ::Gitlab::Middleware::ReadOnly::Controller.new(@app, env).call
       end
     end
   end